supress btrbk_run lastest link error

fix copy: only add ssh for remote

modules/filesystem/btrfs/btrbk.lib

@@ -74,7 +74,7 @@ for snap in $latest; do
 # [[ -e $dest/${snap%%.*}.latest ]] && $dry_run_echo sudo rm $dest/${snap%%.*}.latest
 local cmd="sudo ln -srfn  $dest/$snap $dest/${snap%%.*}.latest"
 echo $cmd 
-[[ ! $dry_run ]] && $cmd
+[[ ! $dry_run ]] && $cmd >&2 /dev/null
 done
 done
 

modules/utility/copy.lib

@@ -186,7 +186,9 @@ EOF
       else
         args+=("${@:1}")
     fi
-    args+=( "$(remove_end_spaces "-e '$(ssh -l "${sshargs[*]}")'")") 
+
+    [[ $DHOST || $SHOST ]] && [[ $sshargs ]] && args+=( "$(remove_end_spaces "-e '$(ssh -l "${sshargs[*]}")'")") 
+ 
 
   # assemble options
   [[ ! $exec ]] && args+=(--dry-run -v)